BM3860 Mass Flow Meter
User Manual

Please be sure this instruction manual reaches the end user.

Tokin Corporation1

SAFETY PRECAUTIONSBefore proceeding to any work (i.e. installation, operation, or maintenance and inspection),
please always first read this manual and all other related documents thoroughly. After
gaining a proficient understanding of all mechanical and safety precautions please operate
appropriately.

DANGER

If used improperly dangerous conditions which may
result in severe injury or death are assumed.

If used improperly a degree of possibility for minor

CAUTION

injury to personnel , equipment or materials isassumed.

COMPULSORYPROHIBITED

Compulsory item or action.

Prohibited item or action.

Please Note: Even though sections may be listed as “CAUTION”, depending on thesituation serious injuries are possible. All of these symbols indicate important items thatshould always be observed.

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Danger
Please do not use this device for any purpose other than shielding gas flow
measurement.

Precautions
Please use this device only within the prescribed flow rate range.
To prevent foreign objects from entering the devi ce a filter is included.
Please conduct periodic inspections and replace parts as needed.
This is a precise measurement devise. To avoid damage please do not allow it tobe dropped, thrown, or otherwise impacted.
Please do not use this device outside of the gas pressure range. If used beyond theresistance capacity the device will be damaged.
Please avoid using or storing outdoors in direct contact with wind and rain,
sunlight, et cetera. Also please avoid environments where water droplets, fineparticles, dust, high humidity, or corrosive gas are in the atmosphere. In theseconditions, electronic parts deteriorate and cable c onnections corrode resulting indefects.
Please avoid storing in areas subject to vibration or ambient temperatures exceeding
60℃. When actual gas is flowing during a measurement the temperature must bewithin 5℃～50℃. If used outside of that range the measurement performance will
be impaired.

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Table of Contents
1. Product Summary ………………………………………………….…. 5
2. Please Verify Contents ……………………………………………..… 5
3. All Part Names ………………………………………………...……... 5
4. How to Use ………………………………………………………..….. 6
5. Troubleshooting …………………………………………………….... 8
6. Specifications …………………………………………………………. 9
7. Precautions …………………………………………………….…..… 104

1. Summary of Device
This device is a portable mass flow meter designed to measure gas flow from an arc
welding torch. It is battery powered and capable of approximately 24 hours ofcontinuous use.

2. Please Verify Contents
After the device is delivered please immediately verify the following.
１ ． Check the exterior for any damage.
２ ． Check if all the contents are includ ed.
Contents
Description
Quantity
BM3860 Mass Flow Meter
1User Manual
1

3. All Part Names

Power Switch

Gas Mix Selector Switch

Main Body
End ReceiverCoupler (with filter)

Indicator Screen54. How to Use
Please do not use this device outside of the gas pressure range. If used beyond thepressure resistance the device will be damaged.
Regarding BatteriesThis device does not include batteries. Please purchase yourself based on therecommendation below.
Recommended Battery: AA size alkali dry cell, 4 batteries●Installing the BatteriesThere is a battery case inside the main body. Please install batteries according to thebelow instructions.
① Using a screwdriver please remove both screws from the front cover. Detach thecover by pulling from the bottom. While removing be careful not to lose the screws orplastic washers.

Fastening Screw with Plastic Washer②

Be careful of the positive and negative ends when setting the batteries. If using

rechargeable batteries all 4 must be the same identical brand and specification.
③

Please be sure to install the screws in both locations on the front cover withplastic washers.

6● Gas Mix Measurement Configuration
Please select the gas mix before you begin measuring.
There are 6 types of possible gas mix configuration s.
The switch lever facing to the right indicates the corresponding gas configuration .
The side with the bubble mark is SW1.
SW1:
SW2:
SW3:
SW4:
SW5:
SW6:

CO2 100%
Ar100%
Ar 80% + CO2 20%
Ar 70% + CO2 30%
Ar 90% + CO2 10%
Ar 60% + CO2 40%●Power-Up
To power-up this device press the switch on the left hand side.
To prevent battery consumption please keep the switch OFF when not in use. Press theswitch towards the bubble mark to turn the device ON.
●Zero-Point Reset
If the display value exceeds ±0.1 when no gas is flowing, please use the zero -point
reset switch.

Power Switch
Bubble MarkGas Mix Selector
Switch
Bubble Mark
Zero-Point
Reset Switch

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●Flow Rate Measurement
Please press the end receiver to the n ozzle where the gas flows out. While the gas isflowing the flow rate will display on the indicator screen. The flow rate takes
approximately 10 seconds to display. The conversion is based on 20℃, SI units
101.325kPa (one atmospheric pressure).

Please use gas within 5℃ ～ 50℃ without any sudden change in temperature. If
measured immediately after welding the gas temperature can fluctuate significantly
causing the flow rate to display inaccurately.

5.Troubleshooting●If Not Operating Properly
If the device is not operating properly, please reference the below chart.
Issue
If the flow rate is not displaying on
the indicator screen.

Countermeasure
If the batteries are exhausted the flow rate will
not display. Please replace with new batteries.

If the flow rate measurement isinaccurate.

Please verify that the flow rate does not
drastically exceed the measurement range. If
the problem persists, the device must be
repaired by the manufacturer.

86. Specifications
Gas Mixture
Mass Flow Measurement Range
Accuracy
Temperature

Precise Warranty
Temperature
OperatingTemperature
AllowableStorage
Temperate
Allowable Operating Humidity
Utilization Pressure
Pressure Resistance
Required Electric Power
Current Consumption
Other

100% CO2, 100% Ar
Ar/CO2 Mixtures (Ratio: 8:2, 7:3, 9:1, 6:4 ）0～ 50L/min(20℃, 1atm)
CO2: ±3.0% F.S.
Ar/CO2 Mixture:0~30L/min up to±3.0 ％ F.S.
15～ 35℃
5～ 50℃-10～ 65℃
10~90% RH (Assuming no condensation)
2kPa～ 480kPa
980kPaDC6V (AA alkali 1.5Vx4)
60mA or less
RoHS standard, CE standard compatible

97. Precautions
Return Process

If this device has been exposed to toxic gases or hazardous materials fromsemiconductor equipment, please return according to t he「 SEMI E34-Safety Guideline
for Mass Flow Device Removal and Shipment 」 instructions.
Disposal Process

When disposing of this device, please do so according to the local regulations forindustrial waste appropriate to your municipality. This device is composed of mainly
FR-4 (printed wire board), electrical part s, iron (case, screws), SUS (gas connectionparts), fluorine rubber (O -ring), CR rubber (receiver).

BM3860 Mass Flow Meter
2018/05/28 Version 1.0 First Publication
Inquiries
TOKIN CORPORATION
1503 Okubo-cho, Nishi-ku, Hamamatsu-shi, Shizuoka Japan 432 -8006
TEL

053-485-5555
URL
E-mail

FAX

053-485-5505： http://www.tokinarc.co.jp/： trading@tokinarc.co.jp

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